That is fixed in later IOS releases.
Another workaround is to make the 2924 ports going to the router
spanningtree portfast, so the down/up is about a second, rather than 30
seconds.
Spencer Garrett wrote:
> We just bought our first 7200 and I'm trying to work out
> how best to use it. I've run across a pretty sticky problem
> and I'm not finding any help in the fine manuals.
>
> I'm using vlans on some Catalyst 2924XLs and bringing them into
> the router using ISL trunking. This has worked swimmingly
> for me on our 2600 and 3600 routers. When I use the same type
> of configuration on the 7204 (VXR with NPE-224 running 12.0.5T)
> I find that every time I add another subinterface with another
> ISL color *all* the other subinterfaces on the port get reset.
> They're not down long, but all of the BGP, OSPF, and HSRP
> sessions get reset, which is unacceptable. The same configuration
> on 2621s and 3640s does not do this.
>
> Does anyone have any suggestions to help me figure out if
> this is an idiosyncracy of the 7200 series, a hardware
> problem, or a configuration issue?
>
> Here's the basic setup. I'm using a PA-2FE-ISL in slot 2.
>
> interface FastEthernet 2/0
> no ip address
> ip route-cache flow
> duplex full
> no shutdown
>
> interface FastEthernet 2/0.300
> encapsulation isl 300
> ip address x.x.x.x m.m.m.m
> no ip directed-broadcast
>
> interface FastEthernet 2/0.301
> encapsulation isl 301
> ip address x.x.x.x m.m.m.m
> no ip directed-broadcast
>
> When I paste in that second subinterface definition (or
> a third, etc.) *all* of the previously-defined subints
> drop momentarily.
>
> Thanks,
>
> Spencer
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